Ansonia has 7,932 homes, and half of them were standing by 1954. The rules below decide how much of the old roof has to come off and what goes under the new one.
New Roofing Costs connects homeowners with independent local roofing contractors. We do not perform roofing work.
This number connects homeowners who are planning a new roof or a full roof replacement with independent local roofing contractors. It is not for leak repairs or patch jobs. The call must come from the homeowner who decides on the roof. Calls may be recorded.
Permit
Without a permit, Connecticut allows only:
Repairs that are limited to 25 percent of roof covering and building siding within one calendar year.
2022 CSBC, (Amd) R105.2, item 11
Replacing the whole roof crosses that line; Ansonia’s building department issues the permit.
Layers
On a roof that already carries two layers, or slate or tile, the code allows no recover: it is a tear-off (IRC R908.3.1.1). 87% of Ansonia’s homes were built before 1980, so count the layers before comparing quotes.
Source: IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes); 2022 Connecticut State Building Code
Ice barrier
The state’s climate table marks the ice barrier “yes” statewide. It runs from the eave to 24 inches inside the exterior wall, more on steep roofs (IRC R905.1.2); check that the quote lists it.
Source: 2022 Connecticut State Building Code; IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes)
Deck joints
Connecticut adds a 4-inch self-adhering strip over all joints of a plywood or OSB deck ((Amd) R905.1.1). It is not needed under a fully adhered membrane, or on board decks under 3 feet wide, which matters in a town where 35% of homes predate 1940.
Wind and snow
Ansonia’s code design values are a 120 mph ultimate design wind speed and a 30 psf ground snow load; it is in Connecticut’s hurricane-prone region. At that wind speed the code calls for asphalt shingles labeled ASTM D7158 Class G or H (Table R905.2.4.1).
Source: 2022 Connecticut State Building Code; IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes) (2022 CSBC, Appendix AY)
Rules as read on October 24, 2026. Code edition, permit and contract rules for the whole state: roof replacement in Connecticut.
Of 7,212 occupied homes in Ansonia, 4,189 (58%) are owner-occupied. By year built, 35% before 1940, 63% before 1960, 87% before 1980; 7% went up in 2000 or later. (ACS 2020–2024.)
By building type: 48% detached houses, 5% attached single-family houses (rowhouses, twins and townhouses), 37% buildings of two to four units.
On a house built before 1940, ask what the deck is (boards or plywood) and whether slate sits under the later layers: slate can’t be roofed over, and Connecticut’s joint-tape rule does not apply to narrow board decks.
Of the 27 New Haven County municipalities on this site, Ansonia has the largest share of homes built before 1980: 87%, against a county range of 38% to 87%.
ZIP codes: 06401
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Ansonia | 1954 | 87% | 58% | 5% | 9 |
| Derby | 1967 | 72% | 62% | 18% | 10 |
| Seymour | 1973 | 61% | 74% | 4% | 11 |
| Woodbridge | 1967 | 67% | 93% | 2% | 8 |
| Shelton | 1977 | 54% | 77% | 12% | 10 |
| Orange | 1964 | 73% | 89% | 3% | 9 |
Median built: median year the homes were built. Before 1980: share of homes built then. Owners: share of homes that are owner-occupied. Row, twin: share of homes that are rowhouses, twins or townhouses. Census ACS 2020–2024. Hail days: days with hail of 1 inch or larger within 10 miles, 2006–2025, NOAA Storm Prediction Center.
NOAA’s storm reports show 9 days since 2006 with hail of at least 1 inch inside a 10-mile circle around Ansonia, topping out at 1.75 in on October 4, 2010. The most recent was August 3, 2024.
Federal major-disaster declarations for storms in New Haven County since 2006: 12, most recently DR-4820, Severe Storm, Flooding, Landslides, and Mudslides, declared September 2024. (OpenFEMA.)
A report says hail fell near Ansonia, not that it damaged a roof. When wind or hail damage means a new roof.
Lifespans come from HUD’s capital-needs table, not from a brochure. More in the guides to shingles, metal, slate and flat roofs.
| Material | HUD useful life | Fits a house like | Watch for |
|---|---|---|---|
| Asphalt shingles | 20 years | Most pitched roofs; 48% of homes here are detached | Class G or H at 120 mph design wind (IRC Table R905.2.4.1) |
| Metal (standing seam, panels) | 50 years | Low pitches and long runs | Standing seam that carries its own loads can skip the tear-off (R908.3.1) |
| Slate | 75 years | Older houses; 35% here predate 1940 | Sound slate can be reused (R908.5); broken slate cannot |
| Flat roof: EPDM or TPO | 15 years | Porches, additions, low-slope rears | Seams at walls and drainage |
Look up the home improvement registration (C.G.S. § 20-420) of anyone pricing a roof in Ansonia; the law forbids presenting it as an endorsement of workmanship (§ 20-427(b)(6)).
The price side is in what a new roof costs in Connecticut; the paperwork side in checking a roofing contractor.
The 25 percent line. Replacing the whole roof crosses that line; Ansonia’s building department issues the permit.
On a roof that already carries two layers, or slate or tile, the code allows no recover: it is a tear-off (IRC R908.3.1.1). 87% of Ansonia’s homes were built before 1980, so count the layers before comparing quotes.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Ansonia was built in 1954, 87% of homes were built before 1980, 58% are owner-occupied.
Hail of 1 inch or larger was reported on 9 days within 10 miles of Ansonia from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
Look up the home improvement registration (C.G.S. § 20-420) of anyone pricing a roof in Ansonia; the law forbids presenting it as an endorsement of workmanship (§ 20-427(b)(6)).
The full list: before you call.
Checked October 24, 2026. Laws and code editions change; the date says when these were last read at the source.